Model comparison
Claude Sonnet 5.5 vs MiMo-V2.6-Pro
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 50.3 on the Noometry Index. MiMo-V2.6-Pro costs 7.4× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.
Last verified . 19 shared benchmarks.
Summary
- They share 19 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 7 categories and MiMo-V2.6-Pro in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 54.5.
- The biggest single-benchmark swing is ProofBench: 100% for Claude Sonnet 5.5 and 70% for MiMo-V2.6-Pro.
- MiMo-V2.6-Pro is cheaper at $0.43 / $0.87 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- MiMo-V2.6-Pro accepts more context: 1.05M tokens versus 1M.
- MiMo-V2.6-Pro has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 5.5 | MiMo-V2.6-Pro | |
|---|---|---|
| Provider | Anthropic | Xiaomi |
| Noometry Index | 61.9 | 50.3 |
| Released | 2026-09-28 | 2026-09-21 |
| Weights | Proprietary | Open |
| Context window | 1M | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $2 | $0.43 |
| Output $ / M tokens | $10 | $0.87 |
| Results tracked | 32 | 19 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 67.3 (#6), MiMo-V2.6-Pro: 55.5 (#23)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| LMArena WebDev | 1774 | 1629 |
| SciCode | 61% | 60.9% |
| LMArena Coding | 1513 | 1534 |
| ALE-Bench | 1,819 | 1,158 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| FrontierSWE | 61.9% | — |
Agentic & Tool Use Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.0 (#16), MiMo-V2.6-Pro: 37.5 (#35)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| APEX-Agents | 75.5% | 59.5% |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 54.0 (#28), MiMo-V2.6-Pro: 43.1 (#50)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| CritPt | 31.4% | 26.6% |
| LMArena Hard Prompts | 1495 | 1512 |
| NYT Connections (extended) | 80.5% | — |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | 165.03 | — |
Math Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 87.9 (#6), MiMo-V2.6-Pro: 54.5 (#45)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| ProofBench | 100% | 70% |
| LMArena Math | 1510 | 1494 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath Erdős | 2.9% | — |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#12), MiMo-V2.6-Pro: 43.5 (#92)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Expert | 1540 | 1543 |
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
Multimodal Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 51.5 (#6), MiMo-V2.6-Pro: 40.8 (#43)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Vision | 1289 | 1264 |
| Furniture Assembly | 75% | — |
Multilingual MiMo-V2.6-Pro leads
Claude Sonnet 5.5: 55.3 (#30), MiMo-V2.6-Pro: 56.9 (#14)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Non-English | 1452 | 1474 |
| LMArena Chinese | 1522 | 1529 |
| LMArena Russian | 1451 | 1480 |
Instruction Following Too close to call
Claude Sonnet 5.5: 78.3 (#11), MiMo-V2.6-Pro: 78.2 (#12)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Instruction Following | 1495 | 1493 |
Long Context Too close to call
Claude Sonnet 5.5: 45.9 (#28), MiMo-V2.6-Pro: 46.0 (#27)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Longer Query | 1498 | 1501 |
Writing & Preference Too close to call
Claude Sonnet 5.5: 66.0 (#40), MiMo-V2.6-Pro: 66.8 (#33)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Text | 1471 | 1492 |
| LMArena Creative Writing | 1465 | 1468 |
| LMArena Multi-Turn | 1474 | 1464 |
Frequently asked questions
Is Claude Sonnet 5.5 better than MiMo-V2.6-Pro?
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 50.3 on the Noometry Index. MiMo-V2.6-Pro costs 7.4× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.
Which is cheaper, Claude Sonnet 5.5 or MiMo-V2.6-Pro?
MiMo-V2.6-Pro is cheaper. It lists at $0.43 per million input tokens and $0.87 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.
Is Claude Sonnet 5.5 or MiMo-V2.6-Pro better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 55.5 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.6-Pro does, with 1.05M tokens against 1M.
How many benchmarks do Claude Sonnet 5.5 and MiMo-V2.6-Pro share?
19 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and MiMo-V2.6-Pro has 19.